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Which layer of the atmosphere is heated primarily by the absorption of ultraviolet radiation?

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Important Questions on Thermal Properties of Matter

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

The hilum is a scar on the:

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Cotyledon of maize grain is called:

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Two spherical black bodies have radii

r_{1}

and

r_{2}

. Their surface temperatures are

T_{1}

and

T_{2}

. If they radiate same power then

\frac{r_{2}}{r_{1}}

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Why convection cannot take place in a solid?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

State the unit and dimensions of coefficient of convection?

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

It is hotter at the same distance over the top of a fire than it is on the side of it, mainly because :

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass

\frac{m}{2}

and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Explain why felt rather than air is used for thermal insulation even though the thermal conductivity of air is less than that of felt?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Permanent winds blowing toward the equator are called _____.

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Assertion: It is hotter over the top of fire than at the same distance on the sides.

Reason: Air surrounding the fire conducts more heat upwards.

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Trade wind is an example of which of these?

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Ventilators are provided in rooms just below the roof. Why?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

An ordinary electric fan does not cool the air; still, it gives comfort in summer. Explain.

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Which method of heat transfer depends on gravity?

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

In which of the following process, convection does not takes place primarily?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

The equatorial and polar regions of the earth receive unequal solar heat. The convection current arising due to this is called:

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Explain how convection causes trade winds.

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Explain the role of rotation of earth in the movement of trade winds.

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

In which of the following processes, convection of heat does not take place?

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Heat Transfer

Two liquids

A

and

B

are at

32 ° C and 24 ° C .

When mixed in equal masses the temperature of the mixture is found to be

28 ° C

. Their specific heats are in the ratio of

Which layer of the atmosphere is heated primarily by the absorption of ultraviolet radiation?

Important Questions on Thermal Properties of Matter

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